6505+ Fault Microphonic squealing / whistling, but stops when a pedal is plugged into front end!
Hi,
I have a 6505+ amp and the Crunch Channel only whistles and howls like an old kettle. The pitch of the whistle changes as the gain knob is altered...
Marshall 9004 Rackmount Preamp Negative Voltage Supply
Hi, I have a Marshall 9004 rackmount preamp here (schematic attached) which is not producing sound output, apparently on account of the negative voltage rail...
Egnater ie4 has an intermittent "blatty" gated sound on Ch3. Help please
I have a '96 silver faced Egnater ie4. It has served me well in my band for several thousand gigs. Over the last year or so I occasionally get a "blatty"...
Hello everyone,
I'm working on a project right now with active pickups using an EMG-style preamp and potentially an active tone filter. The circuits...
Problem with microphonic tubes that are brand new.
I just overhauled a vintage Fender Princeton Reverb (not a reissue) that was found in an attic and hadn't been operated in years, and of course replaced all...
Organ Conversions - Guitar Preamp/Master Vol/ Tone... Help!
Anyone out there got great ideas to convert organ's to guitar amps. Really not interested in re-making one from scratch. Just re-engineering what's needed...
Same Prosonic, Different Problem - ocillation/scratching noise on loud low note decay
Working on a Prosonic combo that somewhat intermittantly seems to breakup into ocillation/microphonics coupled with scratchyness at the loudest part of the...
Hi. After googling many hours, of course I end up asking here. I'm sure this question was made before but I couldn't get the answer by myself so here I am......
I found this Pentron MM4 microphone mixer and would like to try using it for recording. It has 4 channels each going through one section of a 12ax7. I thought...